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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 89, No. 2, 1994, pp. 153-160
Bioline Code: oc94033
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 89, No. 2, 1994, pp. 153-160

 en Gundlachia dutrae check for this species in other resources : n. sp. from Northwest Brazil (Mollusca: Basommatophora: Ancylidae)
Sonia Barbosa Dos Santos

Abstract

A new species of Gundlachia,  Gundlachia  dutrae
  check for this species in other resources
 , is
described from northwest Brazil.

It is distinguishable from other congeneric species by characteristics of the shell, radula and internal organs.

Shell relatively high. Aperture near-circular; periostracum dark brown without periostracal hairs. Apex slightly inclined to the right, projected but not hooked, with an apical depression surrounded by a sculpture of well-marked irregular punctations. Shell surface with prominent radial sculpture. No septate specimens were observed. Ratios (n=59): shell width/shell length = 0,66-0,79 (mean 0,73); shell height/shell length = 0,32-0,45 (mean 0,37); shell height/shell width = 0,43-0,63 (mean 0,51).

Body of normal ancylid type; mantle pigmentation dark brown or black, concentrated along the mantle collar.

The dorsal surface of the right anterior muscle is elongated and medially constricted. The left anterior and the posterior muscles are almost elliptical. Adhesive area is V-shaped.

Pseudobranch unpigmented bearing a very small and thin dorsal lobe.

Ovotestis with more than 25 unbranched diverticula. Ovispermiduct with seminal vesicle rather developed. Elongated nidamental gland continuous with the glandular wall of the uterus. Nidamental gland appendix ending into a bulbous swelling. Spermathecal body almost rounded. Well-developed prostate with five long diverticula. Ejaculatory complex with long glandular flagellum, without a penis or true ultra-penis. "Penis sheath" developed. "Ultra-penis" projected as a tube inside the lumem of prepuce, with a slit between "ultra-penis" and "penis sheath".

Rachidian tooth tetracuspid, with two median cusps assymmetrical and aculeated. Lateral teeth tricuspid, with a reduced endocon and a prominent mesocon. A well marked gap occurs between meso and ectocon. Marginal teeth similar to lateral ones.

Jaw T-shaped, with about 28 dorsal plates.

Keywords
Mollusca - Ancylidae - Gundlachia dutrae - morphology

 
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